From: Stefan Windfeldt-Prytz Date: Thu, 15 Feb 2018 14:02:53 +0000 (+0100) Subject: iio: buffer: check if a buffer has been set up when poll is called X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9dc4030c87b77f7856b7d1388ad908e6a6d5f363;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git iio: buffer: check if a buffer has been set up when poll is called commit 4cd140bda6494543f1c1b0ccceceaa44b676eef6 upstream. If no iio buffer has been set up and poll is called return 0. Without this check there will be a null pointer dereference when calling poll on a iio driver without an iio buffer. Cc: stable@vger.kernel.org Signed-off-by: Stefan Windfeldt-Prytz Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index d2b465140a6b..78482d456c3b 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -175,7 +175,7 @@ unsigned int iio_buffer_poll(struct file *filp, struct iio_dev *indio_dev = filp->private_data; struct iio_buffer *rb = indio_dev->buffer; - if (!indio_dev->info) + if (!indio_dev->info || rb == NULL) return 0; poll_wait(filp, &rb->pollq, wait);